Pressure-gage.



F. SGHUBERT.

PRESSURE GAGE.

uruoxrmx mum Ammo, 1m.

920,668. Patented May 4, 1909.

wnusssas INVENTOR 4i Frederick Schube rt, W

ATTORNEY UNITED STi-XIES PATENT OFFICE.

PRESSUREGAGE.

Be it known that l, iiiln'r. a citizen of t he ['nitcd tatcs, and rcsident of Scllcrsvillc, in thc county of llucks and State of lennsvlvtinia. have invcntctl certain new and useful improvement iii Pressure-Gages. of which the Following is a HIHCillCIlllUH.

My invention relates to improvement in pressure gages, the object; being to provide a means for returning the indicator to the zero 1 mark when the Bourdon' spring becomes set all 'er use.

I will premise my invention bystatingthat when a gage has been in use for a number of years, the constant. pressure has a tendency to increase the circle of the liourdon spring, and when the gage is at rest or undcrno'pressure, the indicator does not return to the zero mark because the said spring is sct". To overcome this defect, I use it spiral spring under tension when calibratingt 1e gage. as will be fully described hereinafter.

The accompanying drawings, which form part of this specification show, in l iguro I, it

front elevation of niv llll irovcd "a e. the dial and indicator being broken away to show interior construction. Fig. .2 is a plan view on dotted line 13 of Fig. 1.

Similar reforenctsnutubers indicate parts in the two views. Y

My improvement consists in arranging a sup ilenicntal spring on the liourdon spring, ,m-l

combined springs so that the indicator can be set at zero at any time by the user without removing any parts for that purpose.

I show itt Fig. l a gage having it Case; 1.

dial, 2, indicator, 3, post, 4. lmurdon spring",

5. sector, ti, and link, 7.

()n the free end of thc Bout-don spriiig I provide a hook, H. to which onc end of the supplemental spring, 91 is l'astcncd. the upper end being passcd through tht eve of a lever, 10 which is l'ulcrotncd on a stud, It, and held in place by a screw, l2. The free end til the lever contacts with an adjusting screw. l3, threaded in thc case, which screw has a square head extending (iltlsitlt' of the case to permit adjustment, by incans of a clock key not shown this screw is protected by a suitable housing, 14, which is l'aslencd to the case.

Such being the eonstniction, the operation Specification of Letters Patent.

Application tiled April 10. 1908.

Flttll t-ltttlli Scot crablv at the top of the case. and by adjusting nicans regulate the tension of the Patented May 4, 1909.

Serial No. 426.249.

1 is a follows: \l'la the gage is .-tssctnbled as tlt' cl'ibcd. a tcnsion is put upon the supplciucntal pring so that the Bourdon spring will bc carried upward and outward as though under pres ure; iii calibrating the -scale, the spring) is taken into account. the said spring being under a tension as stated. When, after use, it is found that the Bourdon spring has become set." so that the indica tor does not return to zero when there is no pressure on the gage, the tension of the suppleniental spring is relaxed by means of the adjusting screw, 13, until the indicator again points to zero, when the gage will again indicate the correct pressure. Another inti poi-taut feature in using this supplemental E spring is that its use prevents the indicator 5 from vibrating, when the gage is used on l transportable boilers such as locomotives. strain rollers and so forth.

What I claim as new and de ire to secure by Letters Patent is l. A pressure gage comprising a Bourdon I spring carrying a hook at one end, a pivoted lever, a supplemental spring connecting the liook with one end of the lcvcr and means engaging with the ot hcr cud l' the lcvcr for ad- ;jnsting it. l 2. pressure gage comprising a llourdon spring, a pivoted lcvcr. a supplemental spring connecting one cnd ol' the Hourdon spring with onccnd'ol' the lever, and means l engaging with the other end of thc lever for adjnslingit. t it .\pi"essurc gage comprising a llourdon I spring. a. curved pivoted lever, a supplemental spring connectingone'cnd ol' the Bout-don spring to one cud ol the lever andincitns engaging with the other end of thc lever for adt justingit.

4'. pressure gage coinprisina casing, a Bourdon spi'i ig arranged thcrcm, a curved lover pivoted iltlt'ttpit'illntt its ends and positioned within said casing. a supplemental spring connecting one end of the Bout-don spring to one end of the lever, atid incaus extending in the casing and engaging with the other end of the lever for adjusting it.

h'igttcd at Hcllcrsvillc in the county of Bucks anti htatc ol' Pcnnsvlvania this 6th day of .\pril A. l). ltJUh.

FREDERICK. St lll'lll llt'l.

.. llnntn' 'l. Wiretaps.

ill-3 

